如何在 C#/Win32 中将文本发送到记事本？
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How to send text to Notepad in C#/Win32?
提问by lolcat
I'm trying to use SendMessage to Notepad, so that I can insert written text without making Notepad the active window.
我正在尝试使用 SendMessage 到记事本，以便我可以插入书面文本，而无需将记事本设为活动窗口。
I have done something like this in the past using SendText, but that required giving Notepad focus.
我过去使用 做过类似的事情SendText，但这需要给予记事本焦点。
Now, first I'm retrieving the Windows handle:
现在，首先我要检索 Windows 句柄：
Process[] processes = Process.GetProcessesByName("notepad");
Console.WriteLine(processes[0].MainWindowHandle.ToString());
I've confirmed it's the right handle for Notepad, the same shown within Windows Task Manager.
我已经确认它是记事本的正确句柄，与Windows Task Manager.
[DllImport("User32.dll", EntryPoint = "SendMessage")]
public static extern int SendMessage(int hWnd, int Msg, int wParam, int lParam);
From here, I haven't been able to get SendMessage to work in all my experimentation. Am I going in the wrong direction?
从这里开始，我无法让 SendMessage 在我的所有实验中工作。我是不是走错方向了？
采纳答案by ebattulga
[DllImport("user32.dll", EntryPoint = "FindWindowEx")]
public static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);
[DllImport("User32.dll")]
public static extern int SendMessage(IntPtr hWnd, int uMsg, int wParam, string lParam);
private void button1_Click(object sender, EventArgs e)
{
Process [] notepads=Process.GetProcessesByName("notepad");
if(notepads.Length==0)return;
if (notepads[0] != null)
{
IntPtr child= FindWindowEx(notepads[0].MainWindowHandle, new IntPtr(0), "Edit", null);
SendMessage(child, 0x000C, 0, textBox1.Text);
}
}
WM_SETTEXT=0x000c
WM_SETTEXT=0x000c
回答by Stefan
You first have to find the child window where the text is entered. You can do this by finding the child window with the window class "Edit". Once you have that window handle, use WM_GETTEXT to get the text which is already entered, then modify that text (e.g., add your own), then use WM_SETTEXT to send the modified text back.
您首先必须找到输入文本的子窗口。您可以通过查找窗口类为“Edit”的子窗口来完成此操作。一旦你有了那个窗口句柄，使用 WM_GETTEXT 来获取已经输入的文本，然后修改该文本（例如，添加你自己的），然后使用 WM_SETTEXT 将修改后的文本发送回去。
回答by Brian
using System.Diagnostics;
using System.Runtime.InteropServices;
static class Notepad
{
#region Imports
[DllImport("user32.dll")]
public static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);
[DllImport("User32.dll")]
private static extern int SendMessage(IntPtr hWnd, int uMsg, int wParam, string lParam);
//this is a constant indicating the window that we want to send a text message
const int WM_SETTEXT = 0X000C;
#endregion
public static void SendText(string text)
{
Process notepad = Process.Start(@"notepad.exe");
System.Threading.Thread.Sleep(50);
IntPtr notepadTextbox = FindWindowEx(notepad.MainWindowHandle, IntPtr.Zero, "Edit", null);
SendMessage(notepadTextbox, WM_SETTEXT, 0, text);
}
}
